Problem is I've come up against a few walls and so want to go to an area I remember, but I can't remember at all how to get there. I know I'm being thick because it wasn't that hard to get to the first few times.

It's the bit where you go very briefly through the valley of drakes, and it has those fat troll dudes in a tunnel, then you go down some ladders etc. Anyone tell me how to get there from Firelink? I've looked all over the place and I know I'm missing it but it's getting annoying.